You can:
1. Handwrite in any fields in Part2. I've seen others in the past handwrite in Arabic, Thai, Vietnamese, etc.
2. In Part8, list Page Number 5, Part Number 2, Item Number 11 or 12. Then, you can type or handwrite in as needed.
For 11.b or 12.b, complete the street number and name as needed. You can spill over to 11.c or 12.c as needed to fit the local address format.
Remember the beneficiary’s address is where the K1 visa will be sent but some embassies/consulates allow for pickups at the embassies/consulates. Also, some embassies/consulates will notify you of their courier services when it is time to deliver, and you can arrange with the courier services about the delivery or pickup.